Results of the Deutsches Institut für Normung (DIN) Kesternich sulfur dioxide test (DIN 50018) are compared with those of long-term industrial atmospheric exposure tests of sheet steels coated with zinc, aluminum, and Al-Zn alloy coatings. According to the Kesternich test results, Al-Zn and zinc coatings provided sacrificial protection to the steel substrate whereas the aluminum coatings did not. Durability was highest for the 55% Al-Zn and aluminum coatings. Qualitatively, these results are in good agreement with those of atmospheric tests. However, durability of 4% Al-Zn and 7% Al-Zn in the Kesternich test was better than two times greater than that provided by zinc coatings. This finding does not agree with the results of long-term atmospheric tests in an industrial environment. These comparisons demonstrate that the Kesternich test provides a useful qualitative ranking of these coatings but should not be relied on to quantitatively predict coating life.
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